Rotary pump and motor hydraulic transmission system



Oct. 27, 1953 c. MOREY 2,656,679

ROTARY PUMP AND MOTOR HYDRAULIC TRANSMISSION SYSTEM Filed Dec. 17, 19454 Shets-Sheet 1 Oct. 27, 1953 c. MOREY 2,656,679

ROTARY PUMP AND MOTOR HYDRAULIC TRANSMISSION SYSTEM Filed Dec. 17, 19454 Sheets-Sheet 2 17 ll ]2'zvenor* Carl/lggmfy C. MOREY Oct. 27, 1953'ROTARY PUMP AND MOTOR HYDRAULIC TRANSMISSION SYSTEM 4 Sheets-Sheet 3Filed Dec.

lLiIl Oct. 27, 1953 2,656,679

ROTARY PUMP AND MOTOR HYDRAULIC I RANSMISSION SYSTEM Filed Dec. 17, 1945c. MOREY 4 Sheets-Sheet 4 0 I /.4 n0 5 &7 w 2 11 /Qi l ,2 A k- Mm W I IIIMII /0 w I '1 l 4 w w w n 7 M I Qua/ 5,

Patented Oct. 27, 1953 ROTARY PUMP AND MOTOR HYDRAULIC TRANSMISSIONSYSTEM Carl Morey, Hamilton, Ohio, assignor to Economy Pumps, Inc.,Hamilton, Ohio, a corporation of Illinois Application December 17, 1945,Serial No. 635,569

6 Claims. 1

This invention relates to a valve operating mechanism in which a fluidpressure system is used and controlled to provide a low displacement anda very high pressure for overcoming the high resistance encountered inbreaking the valve loose from its seat and to provide a highdisplacement at low pressure for speeding up the opening of the valveafter it has been removed from its seat.

According to this invention, the pressure resistance in the fluid motorwhich may be a paddle motor or a hydraulic motor with gears is utilizedfor shifting a valve for changing from low displacement and highpressure to high displacement and low pressure.

Other features and advantages of the invention will be pointed out asthe description proceeds.

The invention comprises the novel structure and combination of partshereinafter described and more particularly pointed out and defined inthe appended claims.

In the accompanying drawings which illustrate a preferred form of thisinvention and in which similar reference numerals refer to similarfeatures in the different views:

Fig. 1 is a side elevational view of a valve operating mechanisminvolving this invention;

Fig. 2 is an end elevational view of the same;

Fig. 3 is a top plan view of the mechanism;

Fig. 4 is a fragmentary side elevational view of a modified form of theinvention;

Fig. 5 is an end elevational view of the modified form of the invention,partly in section on the line 55 of Fig. 4;

Fig. 6 is an enlarged sectional view through the shift valve with partsin diagrammatic form constituting a part of this invention.

Fig. 7 is an enlarged sectional view of the shift valve showing theparts in different positions than in Fig. 6;

Fig. 8 is a view similar to Fig. '7 illustrating a part of theoperation; and

Fig. 9 is a fragmentary sectional view of the valve with a hydraulicmotor according to the modified form of the invention.

'In referring now to the drawing, which illustrates certain preferredembodiments of this invention, there is shown in Figs. 1, 2 and 3 avalve casing I 0 through which a valve stem ll extends. This valve stemmay be attached at its lower end to a gate valve or any other form ofvalve. The invention concerns itself more particularly with the meansfor operating the valve stem. In the present embodimentof the invention,the valve 2 stem is adapted for operation in the direction of itslongitudinal axis, but it could easily be adapted for operation througha turning movement depending upon the type of valve to which it isattached.

Upon the upper end of the valve stem I1 I, there is secured a yoke 12(Fig. l) which abuts a nut l 3 secured upon the upper end of the stem, apair of parallel rack bars I4 are secured to the yoke l2. These rackbars are shown as having integra1 collars [5 above their lower ends andcylindrical portions l6 below the collars which extend through aperturesin the yoke, and which are confined in the yoke by nuts [1 on the lowerends thereof. The collar l5 and nut I! on each rack bar are preferablyspaced apart slightly more than the thickness of the adjacent portionsof the yoke to provide a slight lost motion. The rack bars are providedwith teeth I la upon their inner edges which are engaged by gears 18secured upon a hollow shaft [9 which is operated by a fluid motor 20which may be in the form of the paddle motor 20 shown more clearly inFig. 6, or in the form of the hydraulic motor 2| shown in Figs. 4 and 9.

A reversible electric motor 22 is adapted to be attached to an uppercasing Illa resting upon the lower valve casing. The shaft 23 of thismotor extends freely through the hollow paddle motor shaft [9 and isconnected to a suitable pump 24 mounted in the upper casing beyond thefluid motor and rack bars. The pump end of the easing provides an oil orfluid tank for supplying fluid to the pump which in turn feeds the fluidmotor through a shift over valve mechanism as will presently appear.

The shift over valve mechanism and pump are shown in detail in Figs. 6,7 and 8 and in referring to these figures, it will be noted that thepump and shift over valve have been embodied in one structure althoughthey may be otherwise arranged. The pump consists of two sets of gears,a narrow set 25 and a wide set 26 which are mounted upon the motor shaft23. As the horsepower of the pump is a product of the displacement bythe pressure and by the constant .000583, it will be evident that for agiven horsepower, the narrow set of gears will develop less volume andhigher pressure than the wide set of gears. In the functioning of thismechanism, it is necessary to overcome a very high resistance to breakthe gate valve loose in opening the valve after it has been tightlyclosed and in this connection, the narrow. set of gears provides a lowdisplacement and a very high. pressure for a given horsepower.

After the gate is broken loose from its seat, the power required for itssubsequent travel is relatively low and the hydraulic pressure reduiredoperate thefluid motor is conseguently low. Therefqre,;order to speed upthe movement of the valve, thewide set of gears is introduced to operatein conjunction with the narrow set of gears obtaining thereby highdisplacement at low pressure. accomplished will now be set forth. a

In referring now to Figs. .6, 7 and .8, .it willfbfe noted that thefluid is elevated fronithe-tank by the pump through pipes 28 and 29which com inunicate with a passage 30 that leads to both sets of gearswhen the motor -i's"runnihg"inone direction; when the motor is runninginthe-epposite' direction the fluid will be elevated through .a pipe .2an .a pipe 3B'to passage .31; the p pes 2] iar' ijd;28 having suitablecheck valves 21a and "2.811. "Ijheffluid passing through thewide'gea'rs1.5 is dischars dth ou h .31 iwhichcommunicates with the axial passagetzin the shift cverva-lve 3.73. ,A valve rod .34 .in thea'xial pa .isa'ee3.2 is prov ded with "spac d valve heads 134a, T3412 and'j34 c, Acoiligspring 3 5 which is confined in the axial passagebeyondthe valvehead 34c byian lend plus .35 bears'jagainst the valve head :3whichjjcloses one end of the axialpassage, andgnormally vnrges thevalve'rod into'the position ShowninFig. Tintwhich position .the orificej 3| communicates with the axial passage 32 above thefvalve head 34b.The axial passage 32 com- .miinicjateswith'a passage 13] which isconnected byiap pe .as-to the fluid motor by a pipe as.

The fluid inlet passage 30. in thepump 24 also leads'to the j narrow setofgears 25 which dis chargeithe 'fluid'thro'ugh .the'space'dfl into theaxial valve passage 32 above valvje head 341) from which'thefluid'passes'into passa e .31. Thus in the position 'of the valve .asshown in 'Fig. 7 which is the riormal position, both the wide set ofgears an'd'the'narrow set of gears discharge through the shift overvalve into passage 3! which leads to the fluid motor." The two sets ofgears will continue to .Idischar'ge'fluid to the cornmon dischargepassage 31 as long as the pressure is belowthe'amount to compress thespring35 which'holdsthe valve in the position'shown in Fig. .7. 'Whenthe resistance in the fluid'm'otor becomes great enough to overcomespring '35 which is'setj for about 1250 pounds hydraulic'pressure, oilor fluid froinpassage 3 1wil1'enter passage' ll which leads to a fluidchamber]: under valve head and shift valve 3!! to the position showninFigI It will be noted that valve head alias a 'boss .43 atitsiendwhich provides a space for entering fluid. In the positionshownjin l ig. '6, valve head-34b has closed'communication betweenorifice' 3| and axial passage above such headarid has establishedcommunication between orifice 3! and axial chamber 32 below said head341). 'As a result, 'fluid'will'now pass-from the wide set of' gearsinpump'24 through orifice 3| and axial passage 32 below head 3412. Belowvalve headtdbfaxialriassaige 32 commumcates with aldischarge passage 4.4that'discharges into he tank- When al e 34 i in the pos on shown in. Fi

.6, thenarrow set of gears above discharge fluid to the fluid motor anda low displacement under high pressure is obtained. Under suchconditions the valve will bebrQkenlQoSe frOm its 'seat. As soon as thevalve is broken loose from its seat.

"10 The manner-in which this is 7 'of theipaddl'eiimotor for directdrive.

The fluid line 29 which also leads to the fluid motor-is provided with arelief valve 45 in an offset pipfe4;5discharging into the tank.Likewise, the pipe =38which; leads to the fluid motor is provided with arelief valve 45 in an offset pipe 41 to pipe '38.

When the gate valve or other valve thatmay be attached to the stem H isopen and it is desired to clt'ise the same, it is necessary to reversethe electric motor 22 for driving-the pump in fa reverse'idirection.When the pump'fl is drivenin such reverse direction, the direction offlow ofthe fluid will be reversedas shown in Fig. 8 in which figure theshift over valve isshow n in initial or "normal position. As the pump isdriven in a re- 'verse"direction, fluidjwill be drawn from'the'oil alsobe 'mentioned'that upon direct drive, an

fluid inthe reverse side of the'fluid motor "can escape through pipe 56and'valve 45'to the The'fiuid motor may be'of. the paddle imam typeshown in' Fig. 6 or of the gear'mo'tor whats shown in Figs. 4, '5 and 9.When it is desired to use a gear motor, the reversible electric motor 22may be attached to'on'e en-dof thehousing as shown'inFig. .4, and theshaft 23athereof extended through the casing and attached to the pump 24Which'may be positioned with its shift valve in the other end of thecasing, ori anyother suitable arrangement may' be made. The motor shaft23a'extends freely through a tubular shaft 19a which carriestherack'operating gears '18.

"This tubular shaft in both forms nray be suitably journalled inbearings to relieve pressure upon the motor shaft according to wellknown practice. w The hydraulic motor 21 shown as comprising two gearsand 5|; the gear SObeingkeyed or secured to thetubular shaft l9a midwaybetween the gears l8 and the-cooperating gear '51 being mounted upon ashaftil journalld in the easing 2 la (Fig. i of the hydraulic motor,Fluid is adapted to be supplied to' either side of the-hydraulic motortlnough passages or pipe connections 53 and 54 (Figs. 5 and 9).

In Fig. 9, the hydraulic motor 2| is shown diagrammatically inconnection with the pump an'dthe shift over valve. The pipe 53f is"c6nnected to a pipe 55"which extends from the passage 30 "of the pumpand'which has afrelief'valve e at its lower' end beyond the pipe "53"for discharg ng into the tank. The pipe 54is shown a5 zeonnectedtoa'pipe '51 which extends fr'ointhe motor, pipe 54 is discharging thesame through check valve 58 and when pipe 54 is feeding fluid to themotor, pipe 53 discharges the same through pipe 55 and check valve 55.

In order to maintain the rack bars I4 in operative relation With thegears, guide rollers 59 have been provided which are journalled andattached to the casing adjacent the rack bars at their points ofengagement with the gears [8.

In the operation of the apparatus, assume that it is desired to open thevalve, the electric motor will be started in the proper direction toopen the valve; the motor will drive the pump 24 which will draw oil orfluid from the tank and discharge the same through the low volumecompartment or chamber where the narrow set of gears are located andalso the high volume compartment or chamber where the wide set of gearsfunction. The fluid from these two chambers will pass through the shiftover valve as previously set forth and pass through duct 31 to the fluidmotor. The resistance encountered in breaking the valve loose from itsseat will cause pressure to build up in the fluid motor and when thispressure becomes sufficient to overcome spring 35 which holds shift overvalve closed, the fluid will flow through passage 4| and enter thepressure chamber 42 under valve head 34a and elevate the valve to bringthe valve head 341; above the port 3| as shown in Fig. 6 therebyshutting off the flow from the high volume chamber to the hydraulicmotor and establishing a return flow to the tank through passage 44.

With the low volume chamber of the pump only feeding fluid to thehydraulic motor, there will be a low volume feed under high pressurewith low displacement that will furnish the necessary power to break thevalve loose from its seat. As soon as the valve is broken loose from itsseat, the pressure in the feed line will drop and spring 35 will returnvalve rod 34 to its initial or normal position as shown in Fig. 7 insuch position, both pump chambers will feed fluid to the fluid motor atincreased volume, low pressure with high displacement which will speedup the elevation of the valve to full open position.

When it is desired to close the valve, the electric motor which isreversible will be rotated in the opposite direction, the flow of fluidbeing reversed as shown in Fig. 8 and the shift over valve will remainclosed since there is now no resistance to cause the opening of theshift over valve.

It will be evident that this invention presents numerous advantages in acompact arrangement of the operating mechanism with their reversiblefeatures and wherein a greater power at a low displacement automaticallycomes into play to break a valve loose from its seat and whereinthereafter, a lesser power with high displacement automatically arisesto open the valve after it has been broken loose.

I am aware that many changes may be made and various details ofconstruction modifled without departing from the principles of thisinvention so I do not propose limiting the patent granted thereonotherwise than necessitated by the appended claims.

I claim as my invention: I

1. In a valve operating mechanism including a housing, a valve stem,means for operating said stem including a fluid motor having a hollowshaft in geared relation IWith said stem, fluid pressure means foroperating said fluidmotor in either direction comprising a high volumepumping unit and a low volume pumping unit axially alined, a solid shaftsupporting said units and extending freely thru said hollow shaft andjournalled in said housing, said housing having flow passages extendingfrom said pumping units to both sides of said fluid motor, a springpressed valve in said housing for controlling the flow of fluid fromsaid high volume unit to one side of said fluid motor, said valve havingcommunication with said one side of said fluid motor and being subjectto the pressure of said fluid motor and means for rotating said pumpingunits in either direction.

2. In a valve operating mechanism, a longitudinally extending housing, apump shaft journalled lengthwise in said housing, a fluid motor having ahollow shaft rotatably mounted upon an intermediate portion of said pumpshaft, a

,valve stem geared to said hollow shaft, means for operating said fluidmotor in either direction comprising fluid pressure means having a highvolume pumping unit and a low volume pumping unit axially alined uponsaid pumping shaft beyond one end of said hollow shaft, said housinghaving flow passages extending from said pumping units to both sides ofsaid fluid motor, a spring pressed valve in said housing controlling theflow of fluid from said high volume pumping unit to one side of saidfluid motor, said housing having a flow passage from said valve to theflow passage from the high volume pump and means for rotating said pumpshaft in either direction.

3. In a valve operating mechanism, a combined valve and pump housing, afluid motor having a rotor adapted for clockwise and anti-clockwiserotation, a hollow shaft extending thru said rotor, said housing havinga high volume pumping chamber and a low volume pumping chamber axiallyalined and in spaced relation to said fluid motor, a pump shaftjournalled in said housing and extending freely thru said hollow shaft,pumping elements secured to said pump shaft in said pumping chambers,means for rotating said pump shaft in either direction, said housinghaving flow passages extending from said pumping chambers to each sideof said fluid motor, said housing having a valve chamber adjacent saidpumping chambers, a spring pressed valve in said valve chamber forcontrolling the flow from said high volume chamber under predeterminedconditions, said valve being in communication with one side of saidfluid motor and being subject to the pressure of said fluid motor underpredetermined conditions.

4. In a valve operating mechanism, a combined valve and pump housing, afluid motor having a rotor in said housing, means for rotating saidrotor in either direction comprising a fluid pressure system includingtwo axially alined pumping units in said housing, one of high volumecapacity and the other of low volume capacity, said housing having flowpassages connecting said units with both sides of said fluid. motor,said housing having a valve chamber adjacent said units communicatingwith said fluid motor, a spring pressed valve in said valve chambercontrolling the flow from said high volume

